Atomic Radii
Atomic Radius
Bohr Radius
Covalent Radius
Van der Waals
| Osmium | |
| Electron Configuration | 2,8,18,32,14,2 |
| Electron Configuration | [Xe]] 4f14 5d6 6s2 |
| Electronegativity | 2.2 |
| Enthalpy of Fusion | 29.3 kJ mol-1 |
| Enthalpy of Vaporisation | 738 kJ mol-1 |
| Heat Capacity | 24.7 J mol-1 K-1 |
| Thermal Conductivity | 87.6 W m-1 K-1 |
| Thermal Expansion | 5.1 μm m-1 K-1 |
| Magnetic ordering | No data |
| Electrical resistivity | 81.2 Ω m |
| Speed of sound | 4940 m s-1 |
| Shear modulus | 4940 GPa |
| Bulk modulus | 462 GPa |
| Poisson ratio | 0.25 |
| Mohs hardness | 7.0 |
| Brinell hardness | 3920 MPa |
| Atomic Radii |
|
| Atomic Radius
|
130 pm |
| Bohr Radius
|
185 pm |
| Covalent Radius
|
128 pm |
| Van der Waals
|
0 pm |
| Oxidation States |
|
| Main
|
Os+4 |
| Other
|
Os-2, Os0, Os+1, Os+2, Os+3, Os+5, Os+6, Os+7, Os+8 |
Ionisation Energies (kJ mol-1)  |
|
| M - M+ |
840 |
| M+ - M2+ |
1600 |
| M2+ - M3+ |
2400 |
| M3+ - M4+ |
3900 |
| M4+ - M5+ |
5200 |
| M5+ - M6+ |
6600 |
| M6+ - M7+ |
8100 |
| M7+ - M8+ |
9500 |